Description:

I am running the latest version of buildah:

~ % buildah version
Version: 1.8.2
Go Version: go1.12.4
Image Spec: 1.0.0
Runtime Spec: 1.0.0
CNI Spec: 0.4.0
libcni Version: v0.7.0-rc2
Git Commit: e23314b1
Built: Fri May 10 07:23:56 2019
OS/Arch: linux/amd64

Trying to run any buildah command as a regular user, results in the following /etc/subuid error:

~/projects/personal/buildah-demos % buildah from centos
ERRO[0000] error reading allowed ID mappings: error reading subuid mappings for user "mcritchlow" and subgid mappings for group "mcritchlow": open /etc/subuid: no such file or directory

However, running any buildah commands as root works fine:

~/projects/personal/buildah-demos % sudo buildah from centos
Getting image source signatures
Copying blob 8ba884070f61 done
Copying config 9f38484d22 done
Writing manifest to image destination
Storing signatures
centos-working-container
~/projects/personal/buildah-demos % sudo buildah images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/library/centos latest 9f38484d220f 8 weeks ago 209 MB

Additional info:
* buildah 1.8.2 (this didn't work in the previous version either)
* This upstream bug is what I'm experiencing, though the reported 'fix' was re: OpenSuse https://github.com/containers/buildah/issues/1169#issuecomment-437572559
* It feels like something along the lines of what is suggested here might be necessary https://bbs.archlinux.org/viewtopic.php?pid=1760391#p1760391 but it's unclear to me if that's exactly the same issue here.

Steps to reproduce:
- Install latest buildah
- Run any buildah command as a regular (non-root) user such as: buildah images, buildah info, etc.